Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
#include "tier0/platform.h"
#include "tier0/progressbar.h"
#include "bitmap/float_bm.h"
#include "mathlib/mathlib.h"
#include "tier2/tier2.h"
#include "tier0/memdbgon.h"
#define SQ(x) ((x)*(x))
int main( int argc, char ** argv )
{
InitCommandLineProgram( argc, argv );
int nCurArg = 1;
float flSpread = 1.0;
bool bCodeChannel[4];
bCodeChannel[0] = false;
bCodeChannel[1] = false;
bCodeChannel[2] = false;
bCodeChannel[3] = true;
while (( nCurArg < argc ) && ( argv[nCurArg][0] == '-' ) )
{
switch( argv[nCurArg][1] )
{
case 's': // spread
{
flSpread = atof( argv[++nCurArg] );
}
break;
case '4': // encode all 4 channels
{
bCodeChannel[0] = true;
bCodeChannel[1] = true;
bCodeChannel[2] = true;
}
break;
default:
printf("unrecogized option %s\n", argv[nCurArg] );
exit(1);
}
nCurArg++;
}
argc -= ( nCurArg - 1 );
argv += ( nCurArg - 1 );
if ( argc != 5 )
{
printf( "format is dist2alpha src_bm.tga dest_bm.tga dest_width dest_height\n" );
exit( 1 );
}
FloatBitMap_t hires_image( argv[1] );
int out_w = atoi( argv[3] );
int out_h = atoi( argv[4] );
FloatBitMap_t lores( out_w, out_h );
float max_rad = 2.0 * flSpread * max( hires_image.Width * ( 1.0 / out_w ), hires_image.Height * ( 1.0 / out_h ));
int irad = ceil( max_rad );
for( int comp = 0;comp < 4;comp ++ )
{
for( int y = 0;y < out_h;y ++ )
for( int x = 0;x < out_w;x ++ )
{
int orig_x = FLerp( 0, hires_image.Width - 1, 0, out_w - 1, x );
int orig_y = FLerp( 0, hires_image.Height - 1, 0, out_h - 1, y );
if ( bCodeChannel[ comp ] )
{
float closest_dist = 100000;
int inside_test = ( hires_image.Pixel( orig_x, orig_y, comp ) >.9 );
for( int oy =- irad;oy <= irad;oy ++ )
for( int ox =- irad;ox <= irad;ox ++ )
{
int x1 = orig_x + ox;
int y1 = orig_y + oy;
if ( ( x1 >= 0 ) && ( x1 < hires_image.Width ) && ( y1 >= 0 ) && ( y1 < hires_image.Height ) &&
( inside_test != ( hires_image.Pixel( orig_x + ox, orig_y + oy, comp ) >.9 )) )
{
float d2 = sqrt( (float ) ( SQ( ox ) + SQ( oy )) );
if ( d2 < closest_dist )
closest_dist = d2;
}
}
// done
float dnum = min( 0.5f, FLerp( 0, .5, 0, max_rad, closest_dist ));
if ( !inside_test )
dnum =- dnum;
lores.Pixel( x, y, comp ) = 0.5 + dnum;
}
else
lores.Pixel( x, y, comp ) = hires_image.Pixel( orig_x, orig_y, comp );
}
}
lores.WriteTGAFile( argv[2] );
return 0;
}